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/**
* \file
*
* \brief SAM Divide and Square Root Accelerator (DIVAS) Driver
*
* Copyright (c) 2015 Atmel Corporation. All rights reserved.
*
* \asf_license_start
*
* \page License
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The name of Atmel may not be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 4. This software may only be redistributed and used in connection with an
* Atmel microcontroller product.
*
* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* \asf_license_stop
*
*/
/*
* Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
*/
#include "divas.h"
/**
* \internal
* \brief Initializes and enables the Divide and Square Root Accelerator (DIVAS) Driver.
*
* Enable the clocks used by Divide and Square Root Accelerator (DIVAS) Driver.
* Enable leading zero optimization.
*
* \note When SYSTEM module is used, this function will be invoked by
* \ref system_init() automatically if the module is included.
*/
void _system_divas_init(void);
void _system_divas_init(void)
{
/* Turn on the digital interface clock. */
system_ahb_clock_set_mask(MCLK_AHBMASK_DIVAS);
DIVAS->CTRLA.reg &= ~DIVAS_CTRLA_DLZ;
}
/**
* \brief Signed division operation
*
* Run the signed division operation and return the quotient.
*
* \param[in] numerator The dividend of the signed division operation
* \param[in] denominator The divisor of the signed division operation
*
* \return The quotient of the DIVAS signed division operation.
*/
int32_t divas_idiv(int32_t numerator, int32_t denominator)
{
/* Disable interrupt. */
cpu_irq_enter_critical();
/* Signed division. */
DIVAS->CTRLA.reg |= DIVAS_CTRLA_SIGNED;
/* Write the dividend to DIVIDEND register. */
DIVAS->DIVIDEND.reg = numerator;
/* Write the divisor to DIVISOR register. */
DIVAS->DIVISOR.reg = denominator;
while(DIVAS->STATUS.bit.BUSY){
/* Wait the division is complete. */
}
int32_t quotient = DIVAS->RESULT.reg;
/* Enable interrupt. */
cpu_irq_leave_critical();
return quotient;
}
/**
* \brief Unsigned division operation
*
* Run the unsigned division operation and return the results.
*
* \param[in] numerator The dividend of the unsigned division operation
* \param[in] denominator The divisor of the unsigned division operation
*
* \return The quotient of the DIVAS unsigned division operation.
*/
uint32_t divas_uidiv(uint32_t numerator, uint32_t denominator)
{
/* Disable interrupt. */
cpu_irq_enter_critical();
/* Unsigned division. */
DIVAS->CTRLA.reg &= ~DIVAS_CTRLA_SIGNED;
/* Write the dividend to DIVIDEND register. */
DIVAS->DIVIDEND.reg = numerator;
/* Write the divisor to DIVISOR register. */
DIVAS->DIVISOR.reg = denominator;
while(DIVAS->STATUS.bit.BUSY){
/* Wait the division is complete. */
}
uint32_t quotient = DIVAS->RESULT.reg;
/* Enable interrupt. */
cpu_irq_leave_critical();
return quotient;
}
/**
* \brief Signed division remainder operation
*
* Run the signed division operation and return the remainder.
*
* \param[in] numerator The dividend of the signed division operation
* \param[in] denominator The divisor of the signed division operation
*
* \return The remainder of the DIVAS signed division operation.
*/
int32_t divas_idivmod(int32_t numerator, int32_t denominator)
{
/* Disable interrupt. */
cpu_irq_enter_critical();
/* Signed division. */
DIVAS->CTRLA.reg |= DIVAS_CTRLA_SIGNED;
/* Write the dividend to DIVIDEND register. */
DIVAS->DIVIDEND.reg = numerator;
/* Write the divisor to DIVISOR register. */
DIVAS->DIVISOR.reg = denominator;
while(DIVAS->STATUS.bit.BUSY){
/* Wait the division is complete. */
}
int32_t remainder = DIVAS->REM.reg;
/* Enable interrupt. */
cpu_irq_leave_critical();
return remainder;
}
/**
* \brief Unsigned division remainder operation
*
* Run the unsigned division operation and return the remainder.
*
* \param[in] numerator The dividend of the unsigned division operation
* \param[in] denominator The divisor of the unsigned division operation
*
* \return The remainder of the DIVAS unsigned division operation.
*/
uint32_t divas_uidivmod(uint32_t numerator, uint32_t denominator)
{
/* Disable interrupt. */
cpu_irq_enter_critical();
/* Unsigned division. */
DIVAS->CTRLA.reg &= ~DIVAS_CTRLA_SIGNED;
/* Write the dividend to DIVIDEND register. */
DIVAS->DIVIDEND.reg = numerator;
/* Write the divisor to DIVISOR register. */
DIVAS->DIVISOR.reg = denominator;
while(DIVAS->STATUS.bit.BUSY){
/* Wait the division is complete. */
}
uint32_t remainder = DIVAS->REM.reg;
/* Enable interrupt. */
cpu_irq_leave_critical();
return remainder;
}
/**
* \brief Square root operation
*
* Run the square root operation and return the results.
*
* \param[in] radicand The radicand of the square root operation
*
* \return The result of the DIVAS square root operation.
*/
uint32_t divas_sqrt(uint32_t radicand)
{
/* Disable interrupt. */
cpu_irq_enter_critical();
/* Write the radicand to DIVIDEND register. */
DIVAS->SQRNUM.reg = radicand;
while(DIVAS->STATUS.bit.BUSY){
/* Wait the square root is complete. */
}
uint32_t result_sqrt = DIVAS->RESULT.reg;
/* Enable interrupt. */
cpu_irq_leave_critical();
return result_sqrt;
}
/**
* \name DIVAS Operation Overloading
* @{
*/
#if DIVAS_OVERLOAD_MODE == true
# if defined ( __GNUC__ )
/**
* \brief Signed division operation overload
*
* Run the signed division operation and return the results.
*
* \param[in] numerator The dividend of the signed division operation
* \param[in] denominator The divisor of the signed division operation
*
* \return The quotient of the DIVAS signed division operation.
*/
int32_t __aeabi_idiv(int32_t numerator, int32_t denominator)
{
return divas_idiv(numerator, denominator);
}
/**
* \brief Unsigned division operation overload
*
* Run the unsigned division operation and return the results.
*
* \param[in] numerator The dividend of the unsigned division operation
* \param[in] denominator The divisor of the unsigned division operation
*
* \return The quotient of the DIVAS unsigned division operation.
*/
uint32_t __aeabi_uidiv(uint32_t numerator, uint32_t denominator)
{
return divas_uidiv(numerator, denominator);
}
/**
* \brief Signed division remainder operation overload
*
* Run the signed division operation and return the remainder.
*
* \param[in] numerator The dividend of the signed division operation
* \param[in] denominator The divisor of the signed division operation
*
* \return The remainder of the DIVAS signed division operation.
*/
uint64_t __aeabi_idivmod(int32_t numerator, int32_t denominator)
{
uint64_t uret;
int32_t quotient, remainder;
/* Disable interrupt. */
cpu_irq_enter_critical();
/* Signed division. */
DIVAS->CTRLA.reg |= DIVAS_CTRLA_SIGNED;
/* Write the dividend to DIVIDEND register. */
DIVAS->DIVIDEND.reg = numerator;
/* Write the divisor to DIVISOR register. */
DIVAS->DIVISOR.reg = denominator;
while(DIVAS->STATUS.bit.BUSY){
/* Wait the division is complete. */
}
/* Read out the result. */
quotient = DIVAS->RESULT.reg;
remainder = DIVAS->REM.reg;
/* quotient in r0, remainder in r1 */
uret = ((uint64_t)quotient & 0x00000000FFFFFFFF ) |
(((uint64_t)remainder ) << 32);
/* Enable interrupt. */
cpu_irq_leave_critical();
return uret;
}
/**
* \brief Unsigned division remainder operation overload
*
* Run the unsigned division operation and return the remainder.
*
* \param[in] numerator The dividend of the unsigned division operation
* \param[in] denominator The divisor of the unsigned division operation
*
* \return The remainder of the DIVAS unsigned division operation.
*/
uint64_t __aeabi_uidivmod(uint32_t numerator, uint32_t denominator)
{
uint64_t uret;
uint32_t quotient, remainder;
/* Disable interrupt. */
cpu_irq_enter_critical();
/* Unsigned division. */
DIVAS->CTRLA.reg &= ~DIVAS_CTRLA_SIGNED;
/* Write the dividend to DIVIDEND register. */
DIVAS->DIVIDEND.reg = numerator;
/* Write the divisor to DIVISOR register. */
DIVAS->DIVISOR.reg = denominator;
while(DIVAS->STATUS.bit.BUSY){
/* Wait the division is complete. */
}
/* Read out the result. */
quotient = DIVAS->RESULT.reg;
remainder = DIVAS->REM.reg;
/* quotient in r0, remainder in r1 */
uret = quotient | (((uint64_t)remainder) << 32);
/* Enable interrupt. */
cpu_irq_leave_critical();
return uret;
}
# elif defined ( __ICCARM__ )
/**
* \brief Signed division operation overload
*
* Run the signed division operation and return the results.
*
* \param[in] numerator The dividend of the signed division operation
* \param[in] denominator The divisor of the signed division operation
*
* \return The quotient of the DIVAS signed division operation.
*/
int32_t __aeabi_idiv(int32_t numerator, int32_t denominator)
{
return divas_idiv(numerator, denominator);
}
/**
* \brief Unsigned division operation overload
*
* Run the unsigned division operation and return the results.
*
* \param[in] numerator The dividend of the unsigned division operation
* \param[in] denominator The divisor of the unsigned division operation
*
* \return The quotient of the DIVAS unsigned division operation.
*/
uint32_t __aeabi_uidiv(uint32_t numerator, uint32_t denominator)
{
return divas_uidiv(numerator, denominator);
}
/**
* \brief Signed division remainder operation overload
*
* Run the signed division operation and return the remainder.
* \param[in] numerator The dividend of the signed division operation
* \param[in] denominator The divisor of the signed division operation
*
* \return The remainder of the DIVAS signed division operation.
*/
__value_in_regs idiv_return __aeabi_idivmod(int numerator, int denominator)
{
idiv_return result;
/* Disable interrupt. */
cpu_irq_enter_critical();
/* Signed division. */
DIVAS->CTRLA.reg |= DIVAS_CTRLA_SIGNED;
/* Write the dividend to DIVIDEND register. */
DIVAS->DIVIDEND.reg = numerator;
/* Write the divisor to DIVISOR register. */
DIVAS->DIVISOR.reg = denominator;
while(DIVAS->STATUS.bit.BUSY){
/* Wait the division is complete. */
}
/* Read out the result. */
result.quotient = DIVAS->RESULT.reg;
result.remainder = DIVAS->REM.reg;
/* Enable interrupt. */
cpu_irq_leave_critical();
return result;
}
/**
* \brief Unsigned division remainder operation overload
*
* Run the unsigned division operation and return the remainder.
* \param[in] numerator The dividend of the unsigned division operation
* \param[in] denominator The divisor of the unsigned division operation
*
* \return The remainder of the DIVAS unsigned division operation.
*/
__value_in_regs uidiv_return __aeabi_uidivmod(unsigned numerator, unsigned denominator)
{
uidiv_return result;
/* Disable interrupt. */
cpu_irq_enter_critical();
/* Unsigned division. */
DIVAS->CTRLA.reg &= ~DIVAS_CTRLA_SIGNED;
/* Write the dividend to DIVIDEND register. */
DIVAS->DIVIDEND.reg = numerator;
/* Write the divisor to DIVISOR register. */
DIVAS->DIVISOR.reg = denominator;
while(DIVAS->STATUS.bit.BUSY){
/* Wait the division is complete. */
}
/* Read out the result. */
result.quotient = DIVAS->RESULT.reg;
result.remainder = DIVAS->REM.reg;
/* Enable interrupt. */
cpu_irq_leave_critical();
return result;
}
# endif
#endif
/** @} */
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